Electromagnetic device



Jan. 22, 1935. e. ATCHISON El AL ELECTROMAGNETIC DEVICE Filed March 31,1951 FIG.

INYENTURS A TCHISDNY C. V. NICHOLS A TTORNE Y Patented Jan. 22, 1935 I fUN ED 1 ELECTROMAGNETlC. Davies.

"George Atchisoii', Jersey as. and, chats Nichols, Montclair, N. jJL assignors 'toWestem Electric flompany,Incorporated,' New N. Y.,-a.corporation of New York v I Ar i a f s l r .".3 f rial N' i 526, 5.

, aching; (c1. iv'z' slzc) g H V M i This invention relates toelectromagnetic ldeing.coil, orwinding .17 having a core'18extendingvices, and .more particularly to electromagnetic .ax'ially therethroughand. projecting from either signaling devices. v v end thereofcAttached'to one end" of thecore'18 In devices of this character it hasbeen. found, is a rear angle pole piece 20 and attached to the in some.instances, that'the magnetizing force opposite end of the core is.atfront angle .pole .5

necessarily employed in order to insure the posi- -.piece 21 to which-isadj-ustably secured an auxtive actuation of the armature or movingele-'iliary'pole piece 22. .The rear faceof the mountment, produces magneticsaturation of the com ing! is notchedxor slotted to accommodate the orpole piece, so that when the magnetic force front pole piece 21,whereby-the signaling device .10 is removed, the armature tends tostick'or adhere is: rigidly secured: to the mounting by a'single to thepole piece due to residual magnetism. screw 24 threaded in the endfofthecore 1 8.

An object of the present invention is-to insure An'armaturer25 ispivotedatone-end upon a the quick and positive release of themoving.elepin 26 carried by the-'rear'pole'piece 20. Adjustment or armaturefrom the magneticpole'piece ably: secured to and extending. from 'thefree end of an electromagnetic device upon cessation of.ofxthewarmatureis a member 28consistin'g ofa the magnetizing force.strip .of.-. resilient1. material, preferablynickeLsile- This object isattained in accordance with a ver. The front end of the member isprovided feature of the present invention by tensioning the with'aflange forming a display shutter 29 which armature or moving element ofthe device while has its front face colored so that when the shutthearmature is attracted by the pole piece and ter assumes its actuatedposition, as shown in 20 utilizing this tension to expedite the releaseof Fig. 1, the colored face will appear before an the armature from thepole piece upon cessation aperture or slot 30 in the face plate 14 andwill of the magnetizing force. In accordancewith one be readilynoticeable to the operator through the embodiment of the invention, theresilient display transparent celluloid strip 15, there being anapershutter carried by the armature of an electroture in the face platefor each signaling device 5 magnetic signaling device is caused toengage a 12. v stop strip while the armature is attracted by the A pin32 depending from the auxiliary pole pole piece, the stop strip beingarranged to slightpiece 22 extends through a slot 33 in the shutter lyflex the resilient shutter and thereby intro- 28. This pin serves toprevent side movement or 30 duce a predetermined tension therein. Thistendisplacement of the shutter. The lower edge of 30 sion insures thequick and positive release of the the face plate 14 is bent inwardly toprovide a armature upon cessation of the current flow shelf or ledge 34for supporting the shutter when through the operating coil of thedevice. in its normal or unactuated position, as indicated The inventionwill be clearly understood from in dotted lines in Fig. 1.

35 the following detailed description when read in In accordance with afeature of the present 35 conjunction with the accompanying drawing, ininvention, means is provided for insuring the which quick and positiverelease of the shutter 28 upon Fig. 1 is an elevational view, partly insection, the cessation of the operating current through of anelectromagnetic signaling device embodythe operating coil 17. This meanscomprises a ing the features of the invention, and shutter stop strip 36having an inwardly extend- 40 Fig. 2 is a fragmentary bottom plan viewof a ing flange 37 formed in its lower edge for enbank of devices of thetype shown in Fig. 1. gaging the flanged outer end of the shutter asReferring to the drawing, the numeral 10 inthe latter approaches itsactuated position. The

dicates a portion of a mounting which is made of stop strip 36 issecured to the front face of the suitable dimensions to accommodate aplurality mounting 10 and is of suflicient length to serve all 5 ofelectromagnetic signaling devices 12 arranged of the devices 12 carriedby the mounting. side by side as shown in Fig. 2. A designationNon-magnetic stop pins are secured to the strip holder 13 and a faceplate 14 are mounted armature 25 to limit the upward movement of in anysuitable manner on the front face of the the armature 25 and to preventthe armature 25 50 mounting 10, atransparent celluloid strip 15 beingfrom contacting with the front pole piece 21 if 50 interposed betweenthe mounting and the face the current through th Operating 0011211 ytime plate. The holder 13 is so formed as topermitreaches an amountsuflicient to overcome the the insertion of and retain in place adesignatension in the member 28. tion strip 16. The operation of thedevice is as fo1lows:The

Each signaling device 12 consists of an operatnormal position of themember 28 is shown in 5 dotted lines in Fig. 1. When the shutter is inthis position, its colored face is not visible through the slot 30 inthe face plate'14. Upon the energize,- tion of the operating coil 1'7,the armature and member 28 are attracted by the pole pieces 21 and 22,whereby the flanged end 29 is moved upwardly ton position wherein itscolored face is visiblexthrough the slot 30. Upon arriving at thisposition, the flanged end 29 engages the flanged lower edge 37 of thestop strip 36, where by continued movement of the armature toward polepieceand a flange portion which forms a stop the attracting pole piececauses to be flexed sufficiently to introduce a predetermined tensiontherein. 'Thislte'nsion serves'to overcome the tendency offthearmaturetostick or j adhere to the attracting pole piece after the;.op--

crating current is discontinued, thereby insuring the quick and positiverelease of the shutter;

It is to be understood that the embodiment of the invention hereinillustrated and described is "merely illustrative of lone particularapplication of the invention which .is capable of numerous having aportion thereof extending beneath. said core in a direction parallelthereto, a pin attached to theparalll portion ofthe: rear. pole piece,an armature having an aperture through one end thereof through whichsaid'pin extends, resting on said rear pole piece, extending parallel tosaid core beneath said front pole piece; and

adapted to be moved upward towardsaid front pole piece when said windingis energized, a nonmagnetic stop pin secured to said armature to limitthe upward movement of the armature toward said front pole piece, anon-magnetic resilient member attached to the other end of said armatureand having integral therewith a visual signal element comprising aflange located forward of said front pole piece, a member secured tosaid front'pole piece having a window portion through which said visualsignal flange is visible when the armature is attracted toward the frontmember for the armature in its non-display position; and meanscontacting with said flange when said, armature is moved upward fortensioning s'aidresilient member.

2. In an electromagnetic signaling device, a core having a windingthereon, front and rear pole pieces secured to said core, a gravityreturn armature movably mounted therebeneath on said rear pole-pieceiand movable-,zupward toward said front pole piece when saidwinding is energized,

a resilient member carried by said'armature and. ,having '-an upwardlyprojectingflange forward of 'said. frontpole -piece'and formingaxdisplay shutter, va member supported by said front pole piece having,a window portion through which the shutter-is visible when the armatureis attracted toward the: front pole piece and also having a flangeportion which forms .a stop member for the shutter flange in its.non-displayposition, and means contacting with said shutter flange whensaid armature iswmoved upward for tensioning said resiiient memberiGEORGE ATCHISON.

CHARLES V. NICHOLS.

